Well getting into his opponents heads was kinda dickish but understandable, but he apparently was always pulling petty shit just to get the advantage. If you watch Pumping Iron you can get a sense of it. I haven't seen it in a long ass time but from what I can remember he was always throwing passive insults, especially to Lou. There's a difference between friendly competition and assholishness. There's a scene where they were sitting down for dinner with Lou's dad and Arnold just came off as arrogant. The worst, though, is the fact that more than once he purposely fucked with Franco and gave him shitty advice. The dude that looked up to him, lifted with him, and had enough trust to come to Arnold (friends or not Arnold was still his competition) and for Arnold to just cold heartedly make his friend do the wrong thing just really pissed me off.